Question: When did Nikephoros II Phokas end his time as Byzantine emperoror?
Paraphrase: What year did Nikephoros II Phokas step down as Byzantine emperor?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q41625 p:P39 ?s . ?s ps:P39 wd:Q18577504 . ?s pq:P582 ?value}